Just back from spending the day at Fota Island and loved it. A fantastic way to see the animals up close. 
Parking onsite is brilliant and for €3 which is fab. Make sure u have a €2 or €1 coin as this is what the exit gate takes but there are signs posted telling you this. There are plenty of places to have picnics which is what we did but there is a cafe which sells sandwiches and fast food.  Lots of playground areas also. Not as many as Dublin zoo though! 
There is a train that can bring you for a ride inside the wildlife park for €1 single of €2 return. It is right at the entrance so we did that and then walked back. You could do it the other way round as the only thing is we missed so many of the animals so we ended up walking most of the park again but itvwas grrat fun and had a safari feel to it & kids loved it! Trains run every 15 mins.
A few negatives though and maybe it's just cause I'm a regular at Dublin zoo but you are not given any maps. There are maps around and Recommended Walking Routes but it would be great to have a map especially the kids love using them.
There isn't a lot of bins about the place. It's a minor thing but I found it a bit odd and no bother carring rubbish but i saw a lot of litter arpund. The toilets are placed around the park but good distances between them and felt like not enough!!  Not a major upset but if you have smallies I'd just have a portable potty with you! 
Overall though a fantastic day out. Loads of animals seen and fantastic memories:) 

